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Monnet Moni


Single-seat single-engined low-wing monoplane with conventional three-axis control. Wing has unswept leading and trailing edges, and constant chord; V-tail. Pitch/yaw control by elevon; roll control by full-span ailerons; control inputs through stick for pitch/roll and pedals for yaw. Cantilever wing; wing profile; double-surface. Undercarriage has two wheels in tandem with wing-tip wheels; no suspension on either wheel. No ground steer-ing. Aluminium-tube/glass-fibre fuselage totally enclosed. Engine mounted at wing height driving tractor propeller.

Shown for the first time at the 1981 homebuilders' convention at Oshkosh, the Moni is defined by its creator as an aerial leisure vehicle, ARV standing for Air Recreational Vehicle. A maximum speed of 120mph (193kph), together with a remarkably well thought out set of aerodynamics classify it as a very light aircraft rather than as a single-seater ultra-light for home building. Following from the single-seat Sonerai of 1970 and the two-seater Sonerai II of 1973, the Moni benefits from this experience and particularly from that of the 1980 Monex, from which it takes its aerodyna-mic configuration (basically rectangular wing, V-tail set at 110O and a canopy which does not deviate from the fuselage line) and its construction method - and with 200mph (322 kph) straight and level on 65 hp, there is clearly not much wrong with the Monex's configuration.

Whereas the Monex uses a two-stroke twin-cylinder Zenoah engine of 440 cc, the Moni has KFM 107. It delivers 22 hp at 6000 rpm which, with direct drive to a 38 inch (96 cm) diameter twin-blade propeller, gives a tip speed of some 300 m/s. The wing has an I-shaped extruded alumi-nium spar together with a false spar on which is hinged the full-span ailerons which also serve as flaps, hinging upwards as much as 8 degrees to reduce the drag in cruise by altering the camber. The skinning is made from a single-sheet rolled around the leading edge, bonded to the ribs and riveted to the false spar. Each wing weighs only 50 lb (23 kg) and is de-mountable for ease of garaging and trailer transport.

In 1983 this aircraft was only sold as a kit, for $6000, and no assembly time was quoted.


Moni Tri-Gear

The Moni Tri-Gear is designed for the low-time pilot. Nosewheel is direct steering. A belly flap provides glidepath control. Wings are removable for trailering.

Engine: KFM 107, 22 hp at 6300 rpm
Propeller diameter 37 inch, 0.96m
No reduction
Power per unit area 0.29hp/sq.ft, 3.2 hp/sq.m
Fuel capacity 4.0 US gal, 3.3 Imp gal, 15.1 litre
Length overall 15.0 ft, 4.57 m
Height overall 3.3ft, 0.99m
Wing span 27.6ft, 8.38m
Constant chord 2.9 ft, 0.88 m
Sweepback 0 deg
Total wing area 75 sq.ft, 7.0 sq.m
Wing aspect ratio 10/1
Empty weight 260 lb, 118kg
Max take-off weight 500 lb, 227kg
Payload 240 lb, 109kg
Max wing loading 6.66 lb/sq.ft, 32.4kg/sq.m
Max power loading 22.7 lb/hp, 10.3kg/hp
Load factors +6.0, -4.0 design
Max level speed 120 mph, 193 kph
Max cruising speed 110mph, 177kph
Economic cruising speed 80mph, 129kph
Stalling speed 38mph. 61 kph
Max climb rate at sea level 500 ft/min. 2.5 m/s
Best glide ratio with power off 20/1 at 50 mph, 80 kph
Take-off distance 400 ft. 122 m
Range at average cruising speed 320 mile, 515km

Moni Tri-Gear
Engine KFM 107, 2 cylinder, 22 hp electric start.
Wingspan: 27’6”
Length: 15’
Gross Wt: 560lbs
Empty wt: 280 lbs
Fuel cap: 4 US Gal



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